Rotary duplicating machine



A. MARCHEV 2,065,385

ROTARY DUPLICAI'ING MACHINE Filed Oct. ll 1935 4 Sheets-Sheet l I I i Q Jardinf Dec., 2 2, 1936. A. MARCHEV ROTARY DUPLICATING MACHINE I 4' Sheets-Sheet 2 Filed Oct. ll, 1935 A. MARCHEV ROTARY DUPLICATING MACHINE Dec. 22, 1936.

Filed Oct. 11, 1935 4 Sheets-Sheet 3 Dec. 22, 1936. A MARCHEV 2,065,385

ROTARY DUPLICATING, MACHINE Filed Oct. 11, 1935 4 Sheets-Sheet 4 Patented Dec. 22, 1336 UNITED STATES PATENT OFFICE ROTARY DUPLICATING MACHINE Alfred Marchev, La Grange, 111., assignor to Ditto, Incorporated, Chicago, 111., a corporation of West Virginia ApplicationOctober 11, 1935, Serial No. 44,523

4 Claims. (01. 101-132) This invention relates to master sheet feedingbeing fed to the drum in this type of machine- 1 have been found to be capable of rubbing off some of the carbon thus causing a blurred master which in turn transfers its defects to the gelatin band.

Also when copy sheets are fed to the drum, the

carbon which has been rubbed off of the master 20 sheet by the fingers and which may still adhere to the fingers often sticks to the copy sheet and is transferred to the gelatin band by the copy sheet to further blur the impression on the gelatin band. It has been found necessary to relieve the pressure upon the master sheet as it is advanced to the'drum in such a fashion as to prevent this blurring taking place.

In the machine of the present invention, means are provided whereby the operator 'of the ma- 3 chine may relieve the master sheet of any pres sure from the sheet feeding mechanism that would tend to distort or blur the legend on the master sheet. The machine also includes means of the afore- 35 mentioned character which does not interfere with the normal operation of the copy sheet paper stop and the guide plate and gripperswhich are necessary in accurately feeding copy sheets to the duplicating band.

40 The'objects and features of the invention will become more apparent from the following description reference being had to the accompanying drawings wherein- Fig. 1 is a plan view of a portion of a dupli- 45 eating machine showing the invention applied thereto;

Fig. 2 is a sectional view on the line 2-2 ,of.

Fig. 1;

Fig. 3 is a sectional view on the line 3-3 of 50 Fi 1; I

Fig. 4 is a sectional view like Fig. 2 showing a changed position of the mechanism; and

.Fig. 5 is a fragmentary sectional view on theline .5-5 of Fig. 1.

' 5;; Referring now in detail to the drawings, the

duplicating machine to which the present invention is applied is of thegsystem rotary type in which a rotary drum idiitis uitably mounted in a frame of which only one side piece H is shown in Fig. 1, the other side piece being shown for 5 example in Fig.- 3 at l2; The drum is suitably mounted upon a shaft 13 and is adapted to be rotated under the control of the operator by means of a motor M also mounted in the frame of the machine and conti'dpted to the drum 0 through suitable gearing indicated generally in Fig. 3 and suitable clutch mechanism not shown. The machine is provided with a feed table l5 which is mounted upon a carriage It. The carriage I6 is pivoted to the'casing by members ll only one of which is shown, it being understood that there is a duplicate member at the opposite end of the carriage for mounting the carriage on the side frame members H and I2. The carriage is normally held in the position shown in the drawings by a latch l8 which engages a stud E9- on the side frame II. The stud I9 is flattened at its free end as shown at 20 in Fig. 3 and is bevelled as shown at 2|. The bevelled portion 2| engages the latch l8 while the flattened portion 20 serves as a resting place for a stop member '22 on the carriage.

Associated with the carriage there is a paper guide 23 supported upon suitable side frame (members such as 24, it being understood that there is another frame member similar to 24 at the opposite side of the machine. This frame member 24 is pivoted on a shaft 25 and has mounted thereon a roller 26 which is adapted to engage the top surface of one of a pair of end 5 frames 21 for the carriage. The shaft 25 also serves-as a pivot fora paper gripper supporting arm 28 which at one end is connected by means of a spring 23 to a stud 30 on the end frame 21 of the carriage.

gripper in a clockwise direction as shown in Figs.

2 and 4 whereby to move the paper grippers against a guide plate 36 which extends across v the carriage and is fixed thereto by means of a 55 At its other end, the arm 28 cooperating with a similar arm at the opposite suitable bracket 51 and screws 55. The guide plate 55 is also cut away at its lower end to provide spaces, as indicated at 39, alternate with the fingers 52.

Beneath the paper guide 35 and the gripper 5|, there is provided a margin bar 50 upon which the sheets fed through the chute formed by the grippers 5| and the guide plate,35 come to rest. This margin bar 55 is supported upon a shaft 5| by means of arms 52, shaft 5| being rotatably iournalled in the end frames 21 of the carriage. The arm 52 also carries a stop projection at 55 adapted to engage a rectangular tie rod 55 which extends across the carriage to connect the end frames 21 thereof. Shaft "is normally urged by a spring 55, which is secured thereto by a clamp 55, in such a'direction as to hold the margin bar in the position shown in the drawings. The spring 55 is wound around the shaft 5| and has its free end secured to a pin 51 on the end frame 21 of the carriage so that rotation of the arm 52 in a clockwise direction to move the margin bar out of the v .y of the drum tightens the spring 55.

This movement of the margin her just referred to is accomplished by means of an arm 58 fixed to the end of the shaft 5| on the outside of the end frame member 21 of the carriage and carrying a roller 59 for engagement with a margin bar cam 55 also fixed to the end of the drum.

Functioning in conjunction with the gripper 5| and the guide plate 55 to hold sheets which are fed into the paper chute while the margin bar 55 is retracted, is a paper stop member 5| which has fingers 52 fitting between the fingers 52 of the gripper 5|. This paper stop 5| is mounted on a shaft 55 which shaft projects through the end frame 21 of the carriage and has rotatably mounted thereon an arm 55 which is provided with a roller 55 adapted to engage a paper stop lifting cam 55 also mounted on the end of the drum I5. There is also a second arm 51 fixed upon the shaft 55 and adapted to engage a pin 55 mounted upon the arm 55. The arm 51 is yieldingly held down against the pin 55 by means of a spring 59 which is secured to the end of the arm 51 and to a pin 55 on the end frame 210i the carriage. As shown most clearly by Figs. 1 and 3, the shaft 55 also carries an arm 5| thereon which arm; is extended out beyond the cam 55 and projects downwardly in line with a bar 52 which is fixed to a hand lever 55 pivoted on a tie rod 55 between the side frames II and I! of the duplicating machine. The hand lever 55, when in the full line position shown in Fig. 3, does not extend into the path of the arm 5| so that, if the cam 55 is moved from beneath the roller 55, the arm 5| is free to rotate in a clockwise direction as shown in Fig. 3 and in a counterclockwise direction as. shown in Fig. 2 to permit the spring 55 to swing the arm 51 and with it the shaft 55 in a direction to bring the paper stop 5| into the stop position illustrated in dotted lines in Fig. 2. However, if the lever 55 is moved into the dotted line position shown in Fig. 3, the bar 52 is brought into position to engage the free end of the arm 5| so that, when the roller 55 moves of! the cam 55, the arm 5| will prevent rotation of the shaft 55 and thus prevent the paper stop 5| from moving into its sheet stopping or normal operating position.

I In the normal operation of the machine, the paper stop 5| is desirably left free to assume its sheet intercepting or stopping position immediatelyuponthecamflmovingoutfromunder aoeases the roller 55 so that a fresh copy sheet may be fed into the paper chute without waiting until the previous sheet has been completely withdrawn. The fingers 52 on the paper stop bear against the sheet being drawn out of the paper guide and pressedagainst the duplicating band by a platen roller 55 which is rotatably Journalled in the carriage frame. This does no injury to a copy sheet, but is sufilcient to blur or mar the legend in soft carbon upon a master sheet because it presses the master sheet against the fingers on the gripper 5| Therefore, when the master sheet is fed into the machine, the operator moves the lever 55 into the dotted line position shown in Fig. 3 to position the bar 52 in the path of the arm 5| so that he may hold the paper stop fingers 52 out of the paper chute until the master sheet is withdrawn, thereby preventing any pressure from. being exerted upon the master sheet by the paper stop.

The lever 55 also functions to control the sheet stripping mechanism in a manner which will now be described. In duplicating machines of this character, the sheet stripping mechanism usually consists of a pair of stripping rolls 55 and 51 which are journalled in an auxiliary stripping frame 55 mounted upon the tie rod 59 which connects the two side frame members II and I2 of the duplicating machine. These two stripping rolls have the front edges of the sheets on the drum l5 directed into them by means of a stripping bar 15 which is carried upon a shaft 1| pivoted in the auxiliary frame 55. This shaft 1| also carries an arm 12 which is provided with a roller 15 adapted to engage a. stripping control cam 15 also mounted on the end of the drum I5. The arm 12 has a fork 15 projecting upwardly therefrom which fork is provided with a pin 15. The lever 55 at its lower end is connected to a link 11 which link at its other end is connected to an arm 15 which is pivoted on a stub shaft 15' mounted in the side frame II of the machine. The arm 15 has a stop means thereon limiting its movement in a counterclockwise direction as shown in Fig. 3. This stop means consists of a screw bolt 15 which screws into an enlargement 55 provided on the arm 15 and is held in adjusted position by a lock nut 5|. The head of the screw bolt 19 is adapted to engage a projection 52 on the end frame ll of the machine. The link 11, as shown most clearly in Fig. 1, is provided with an Lshaped bar 55 riveted thereto adjacent the connection of thelink 11 with the arm 15 and projecting out into alignment with the pin 15. Now, when the lever 55 is moved into the dotted line position shown in Fig. 3, this L-shaped bar 55 engages the pin 15 and prevents the roller 15 from moving toward the drum axis when it moves off its cam 15 so that the stripper bar 15 is not permitted to extend into the hollow part of the drum and direct a sheet on the drum to the stripping rollers. This permits the operator to maintain a master or' acopy sheet up on the drum as long as he desires. The stripper bar 15 is urged toward the drum by a spring 15' in a manner similar to that shown in the prior application hereinbefore mentioned.

From the above description. it is believed that the construction and operation of this device will be readily apparent to those skilled in this art. While one embodiment of the invention has been shown and described, it is to be understood that it is capable of many modifications. Changes, therefore. in the construction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims in which it is the intention to claim all novelty inherent in the invention as broadly as possible in view of the prior art.

The invention having thus been described, what is claimed as new and desired to be secured by Letters Patent is:

1. In a duplicating machine having a duplicating drum, means to rotate said drum, a paper feed chute for feeding sheetsto said drum, and stripping means for stripping sheets from said drum. paper stop means normally extending across said chute to block passage of sheets through said chute, means for temporarily retracting staid paper stop means during rotation of said drum to permit feeding of a sheet through said chute, and means to hold said paper stop means in retracted position after its release by said retracting means.

2. In a duplicating machine having a duplicating drum, means to rotate said drum, a paper feed chute for feeding sheets to said drum, and stripping means for stripping sheets from said drum, paper stop means normally extending across said chute to block passage of sheets through said chute, means for temporarily retracting said paper stop means du'ring rotation of said drum to permit feeding of a sheet through said chute, means to hold said paper stop means in retracted position after its release by said retracting means,

means to render said stripping means functional-' ly inoperative, and a lever controlling said holding means and said last named means.

3. In a duplicating machine having a duplicating drum, means to rotate said drum, a paper feed chute for feeding sheets to said drum, and stripping means-for stripping sheets from said drum. paper stop means normally extending across said chute to block passage of sheets through said chute, means for temporarily retracting said paper stop means during rotation of said drum to permit feeding of a sheet through said chute, and means to hold said paper stop means in retracted position after its release by said retracting means, comprising an arm on said stop means and a manually operable latch for said am.

4. In a duplicating machine having a duplicating drum, means to rotate said drum, a paper feed chute for feeding sheets to said drum, and stripping means for stripping sheets from said drum, paper stop means normally extending across said chute to block passage of sheets through said chute, a spring holding said stop means in .its normal position, means for-temporarily retracting said paper stop means during rotation of said drum to permit feeding of a sheet through said chute, and means to hold said paper stop means in retracted position after its release by said retracting means.

ALFRED MARCHEV. 

